本文選題：6061鋁合金 + 等通道轉(zhuǎn)角擠壓��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：6061鋁合金屬于Al-Mg-Si系合金,具有成型性好,耐腐蝕強(qiáng),密度小等優(yōu)勢,在汽車及航空航天領(lǐng)域運(yùn)用廣泛,是未來可持續(xù)發(fā)展最具前景的材料之一。隨著人們對高強(qiáng)度的輕量金屬材料的需求增大,近年來大塑性變形技術(shù)發(fā)展較快,尤其是等通道轉(zhuǎn)角擠壓法(ECAP,Equal channel angular pressing)和多向壓縮法(CCDC,Cyclic channel die compression),大塑性變形通過細(xì)化晶粒的方法有效地提高材料的強(qiáng)度,而且具有制備工藝簡單,成本低廉等優(yōu)勢,越來越多的學(xué)者對其進(jìn)行深入的探索和研究。本論文在等通道轉(zhuǎn)角擠壓和多向壓縮的基礎(chǔ)上,將兩種方法結(jié)合起來,進(jìn)行不同路徑的復(fù)合鐓擠,并通過力學(xué)性能、X射線衍射、和EBSD方法分析及斷口觀察,研究復(fù)合鐓擠工藝對6061鋁合金組織和性能的影響。研究結(jié)果表明:(1)在35mm/min的擠壓速度下,6061鋁合金的抗拉強(qiáng)度、顯微硬度達(dá)到最大,并且隨著擠壓道次的增加,材料的抗拉強(qiáng)度得到明顯提高。(2)試樣的道次應(yīng)變量為60%時(shí),經(jīng)3道次多向壓縮試樣的抗拉強(qiáng)度達(dá)到293.410 MPa,綜合力學(xué)性能最好。(3)6061鋁合金最佳復(fù)合鐓擠工藝是鐓擠鐓,抗拉強(qiáng)度比單獨(dú)的多向壓縮、單獨(dú)等通道擠壓抗拉強(qiáng)度提高了 1.4倍,延伸率也有所提高,晶粒大小從110-130μm細(xì)化到了 0.98μm,細(xì)晶強(qiáng)化效果最明顯,從宏觀上表現(xiàn)為抗拉強(qiáng)度和伸長率的增加。
[Abstract]:6061 aluminum alloy is a kind of Al-Mg-Si alloy, which has the advantages of good formability, strong corrosion resistance and low density. It is widely used in the field of automobile and aerospace, and is one of the most promising materials for sustainable development in the future. With the increasing demand for light metal materials with high strength, the technology of large plastic deformation has developed rapidly in recent years. In particular, the equal channel angular extrusion (ECAP) equal channel angular pressing) and the multidirectional compression method (CCDCC) cyclic channel die compression can effectively improve the strength of the material by grain refinement, and have the advantages of simple preparation process and low cost. More and more scholars have deeply explored and studied it. In this paper, on the basis of equal channel angular extrusion and multidirectional compression, the two methods are combined to carry out compound upsetting extrusion with different paths, and the mechanical properties are analyzed by X-ray diffraction, EBSD method and fracture observation. The effect of composite upsetting extrusion process on the microstructure and properties of 6061 aluminum alloy was studied. The results show that the tensile strength and microhardness of the alloy reach the maximum at the extrusion rate of 35mm/min, and the tensile strength of the material increases obviously with the increase of extrusion pass. The tensile strength of the multidirectional compression specimen after 3 passes is 293.410 MPA. The best comprehensive mechanical properties. The best composite upsetting process is upsetting, the tensile strength is more than that of the single multi-direction compression, and the tensile strength of the single equal channel extruding is 1.4 times higher than that of the single equal channel compression. The elongation also increased, the grain size was refined from 110-130 渭 m to 0.98 渭 m, the strengthening effect of fine grain was the most obvious, and the tensile strength and elongation increased macroscopically.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.21;TG306

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 M.H.Shaeri;M.Shaeri;M.Ebrahimi;M.T.Salehi;S.H Seyyedein;;Effect of ECAP temperature on microstructure and mechanical properties of Al Zn Mg Cu alloy[J];Progress in Natural Science:Materials International;2016年02期

2 王力;趙西成;楊西榮;王耿潔;劉曉燕;;工業(yè)純鈦ECAP變形組織與織構(gòu)演變的EBSD分析[J];稀有金屬;2015年06期

3 鄧平安;許曉靜;莫紀(jì)平;蔣偉;程曉農(nóng);吳瑤;;多向壓縮對7085鋁合金擠壓材組織和抗腐蝕性能的影響[J];材料熱處理學(xué)報(bào);2014年09期

4 呂夢南;楊西榮;趙西成;胡卜亮;金博宇;;單道次ECAP純鋁織構(gòu)演變的有限元模擬[J];材料科學(xué)與工藝;2014年04期

5 劉滿平;王俊;蔣婷慧;吳振杰;謝學(xué)鋒;劉強(qiáng);Hans J.ROVEN;;高壓扭轉(zhuǎn)大塑性變形Al-Mg鋁合金中的層錯(cuò)和形變孿晶[J];中國有色金屬學(xué)報(bào);2014年06期

6 劉秀娟;劉白;姜俊俠;李慶亮;;連續(xù)往復(fù)式等通道轉(zhuǎn)角擠壓裝置的研究[J];鍛壓技術(shù);2014年05期

7 郭超亞;魯世紅;;鋁合金超聲噴丸殘余應(yīng)力場[J];中國表面工程;2014年02期

8 安祥海;吳世丁;張哲峰;;層錯(cuò)能對納米晶Cu-Al合金微觀結(jié)構(gòu)、拉伸及疲勞性能的影響[J];金屬學(xué)報(bào);2014年02期

9 姜義;史慶南;王璐;趙啟淞;;擠壓速度對雙通道等徑角擠壓7003鋁合金組織的影響[J];金屬熱處理;2013年12期

10 Ali KHOSRAVIFARD;Mohammad JAHEDI;Amir Hossein YAGHTIN;;1050鋁合金扭轉(zhuǎn)擠壓加工的3D有限元分析(英文)[J];Transactions of Nonferrous Metals Society of China;2012年11期

相關(guān)博士學(xué)位論文 前1條

1 張久文;鋁合金高壓扭轉(zhuǎn)變形及其強(qiáng)化模型[D];大連理工大學(xué);2011年

相關(guān)碩士學(xué)位論文 前4條

1 華睿;基于多向壓縮工藝的純鎢組織及性能研究[D];合肥工業(yè)大學(xué);2015年

2 張旭;純鋁等徑角擠壓有限元模擬及實(shí)驗(yàn)研究[D];東北大學(xué);2012年

3 羅許;復(fù)合擠壓制備超細(xì)晶鋁合金及性能、組織演變的研究[D];昆明理工大學(xué);2009年

4 劉海英;超聲噴丸強(qiáng)化機(jī)理的研究[D];太原理工大學(xué);2008年

，

本文編號(hào)：2017262